A tag is a keyword or label that categorizes your question with other, similar questions. Using the right tags makes it easier for others to find and answer your question.
For challenges related to the different ways of expressing an integer as a sum of positive integers.
For challenges involving recursive functions, or functions or programs calling itself, directly or indirectly.
A challenge either involving using logic-gates as the coding language or outputting logic gates.
A busy beaver maximises some property of the computation model (e.g. execution time, memory usage, output length) subject to the constraint that it must halt.
For challenges where trigonometry plays an important role.
a number counting system using the digits 0—9 and A—F. Use this tag for challenges related to hexadecimal.
describes challenges related to factoring numbers and polynomials. Not related to the Factor esoteric programming language.
This challenge involves the manipulation of complex numbers, including parsing and printing them as well as performing complex arithmetic. This tag also encompasses generalised complex numbers like qu…
Used for challenges where answers make reference to themselves or their characteristics, such as length or character values. Since this is a subset of the [quine] tag, many of the same restrictions ap…
For challenges about rearranging a set of mathematical operators or numbers to fulfill a certain expression.
for challenges which require answers to still work when a random edit to the source code is made.
to write a solution using as many programming languages as possible.
For challenges pertaining to mathematical logic and boolean algebra.
For questions that relate to probability or measurements, either outputting or parsing.
Challenge involving processing colors. It can be either for graphical output or manipulation on color codes.
Challenges involving searching through some data to find a certain element or elements.
"problems" presented to users, consisting of spelling/vocabulary challenges. The "problem" is solved when the user(s) decipher the correct spelling.
for challenges involving John Conway's Game of Life.
Challenges that involve summarizing a large amount of data in a single, much smaller number.
for challenges involving integration or differentiation of functions.
For challenges relating in some way to encoding messages using classical (pen and paper) ciphers. For modern ciphers, such as AES, use the [encryption] tag instead.
for challenges involving the game of tic-tac-toe (https://en.wikipedia.org/wiki/Tic-tac-toe).
Challenges relating to producing an audible output or an audio file which could then be played. If a challenge relates to textual representation of sound, it may fit better in the [music] tag.
related to the C# language. Note that challenges that require the answers to be in a specific language are generally discouraged.
For challenges concerning the Rubik's Cube or variations like the Pocket Cube.
directly related to solving, creating, or otherwise working with sudoku puzzles.
for challenges related to the functional programming paradigm.
Involving calculation or other usage of factorials
For challenges involving a small number of words, usually related to word generation. Do not use for "Hello, World!"-like challenges.
A high-level data structure, made of nodes, each with a maximum of 2 children (left and right). Nodes with no children are called leaves, and two nodes with the same parent are known as siblings.
related to Assembly language. Note that challenges that require the answers to be in a specific language are generally discouraged.
specific to numbers represented in floating-point format.
For challenges related to creating or implementing an algorithm.
For challenges related to the processing of text input.
Used for challenges that consist of multiple sub-challenges ("holes"), somehow combining the scores into one score. (Note: combining multiple unrelated challenges together is off-topic)
indicates that the challenge involves Roman numerals